Caterpillar Cat 953 TRACK LOADER (Prefix 20Z) Service Repair Manual (20Z00267 and up)

1
Service Repair Manual
Models 953 TRACK LOADER
2

• START BY
• remove final drives and sprocket assemblies
• remove track brakes

3
1. Drain the oil from the final drive.
2. On a 953 final drive, remove shaft (1). Remove
six bolts and retainer (2). On a 943 final drive
there can be shims under retainer (2).
3. Fasten a hoist to the final drive, and put the
final drive in position on tooling (A), and
install four bolts and nuts to hold the final
drive in place. Weight is 943 - 359 kg (785
lb.), 953 - 495 kg (1100 lb.).
4. Remove the bolts that hold cover (3) in place,
and use two 3/8"-16 NC forcing screws to remove
the cover.
4
5. Use tooling (B) to remove button (4) (if
applicable) from the cover if a replacement is
necessary.
6. Install a 3/8"-16 NC forged eyebolt in shaft
(sun gear) (5), and remove the shaft.

1. Remove the bolts that hold planet carrier (7) to
   the sprocket hub, and install two 5/8"-11 NC
   forcing screws (6) to loosen the planet carrier.
2. Install two 3/8"-16 NC forged eyebolts in the
   planet carrier, and fasten a hoist. Remove planet
   carrier (7). Weight is 943 - 52 kg (115 lb.),
   953 - 79 kg (175 lb.).

9. Bend the locks away from bolts (8). Remove
bolts (8), the locks and retainers (9) from the
planet carrier.
5
10. Use tooling (C) to remove planet shafts (10)
from the planet carrier.
NOTICE The bearings in planet gears (11) are
loose and will fall out of the gears.
11. Move planet gears (11) to the center of the
planet carrier one at a time, and remove them.

1. Remove bearings (12) from the planet gears.
2. Remove plate (13) and the shim(s) from the
   spindle.

6
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NOTE Any time plate (13) is removed new bolts
must be used during final assembly.
14. Use pry bars to loosen ring gear (14) and the
ring gear hub on the spindle. Use two men to
remove ring gear (14) and the hub as a unit.
Weight is 943 - 23 kg (50 lb.), 953 - 32 kg (70
lb.).
15. Remove ring (15) from ring gear (14). Remove
hub (16) from the ring gear.
16. Install tooling (D) on the sprocket hub and
fasten a hoist. Remove sprocket hub (19). Weight
is 943 - 84 kg (185 lb.), 953 - 117 kg (260
lb.). Remove bearing cone (17) and O-ring seal
(18) from the sprocket hub.

1. Carefully remove Duo-Cone seals (20) from the
   sprocket hub and spindle. Be careful not to
   damage the contact surfaces of the seals. Inspect
   the rubber seals of the Duo-Cone seals for any
   cuts or damage.
2. Remove bearing cups (21) from the sprocket hub.

8

1. Use tooling (E) to remove bearing cone (22) from
   the spindle.
2. Remove bolts (23) that hold the spindle to the
   final drive case. Put marks on the spindle and
   case as to the location of the spindle on the
   case. The spindle must be installed in the same
   position on the case because there are holes in
   the spindle that let oil move through the final
   drive case.

21. Fasten tooling (D) to spindle (24), and
fasten a hoist. Install two 5/8"-11 NC forcing
screws in the spindle, and remove the spindle.
Weight is 943 - 36 kg (80 lb.), 953 - 68 kg (150
lb.).
22. Use tooling (F) to remove the bearing race
(943) or bearing (25) (953) from the spindle.
Remove O-ring seal (26) from the spindle.
23. Remove gear (27) from the final drive case.
On a 953 final drive case, two 1/2"-13 NC forged
eyebolts can be installed in gear (27) to make
the removal of the gear easier.
9
(Earlier 943)
NOTICE Bearing (28) (earlier 943) or bearing race
(30) (later 943 and 953) can be removed as shown
in Steps 24, 25 or 26. Remove the bearing or
bearing race only if a replacement is necessary
because the bearing or bearing race will be
damaged when it is removed.
24. Use tooling (G) to remove bearing (28).
(Earlier 943) 25. Install two 3/8"-16 NC
forcings screws (29) in the back side of gear
(27) (943 earlier), and use the forcing screws to
push the bearing off the gear.
(Later 943 and 953) 26. On a 943 (later) and the
953 final drive gear it will be necessary to heat
bearing race (30) for removal.
10
NOTICE Do not let pinion (32) fall out of the
case when it is removed.

1. Install a 5/8"-11 NC forcing screw (31) in the
   final drive case, and use the forcing screw to
   push pinion (32) out of the case.
2. Use tooling (B) to remove thrust plate (33) from
   the case if a replacement is necessary.

943
953 29. On a 943 final drive remove bolt (35)
and the washer from shaft (34). Remove shaft (34)
from the pinion. Remove the O-ring seal from the
shaft.
11
30. Use tooling (H) and a press to remove the
bearing cones from the pinion.

• Remove final drive case (36) from tooling (A),
  and turn it up side down. Weight is 943 - 72 kg
  (160 lb.), 953 - 90 kg (200 lb.).
• Use tooling (J) to remove the bearing cup for the
  pinion bearing from final drive case (36).
• For more information see Bearing Damage Causes
  And Corrections, Form No. FE036004, And Analyzing
  Gear Failures, Form No. FEG45134.

Assemble Final Drives And Sprocket Assemblies
12
1. Use a brass bar and hammer to install thrust
plate (1) with the oil grooves up as
showns. NOTICE All bearing cups and cones must
be installed tightly against their seats to get a
correct bearing preload.
2. Heat bearing cones (4) to a maximum
temperature to 138C (280F). Do not heat the
bearing longer than 8 hours. Install bearing
cones (4) on pinion (5). Use a press to push
bearing cones (4) tightly against their seats
after the bearing cones have become cool.
13

• NOTE Steps 3 and 4 are for 943 drives only.
• Install O-ring seal (2) on shaft (3).
• Put shaft (3) in position in pinion (5), and
  install bolt and washer (6) to hold the shaft in
  the pinion.

5. Use tooling (B) to install the bearing cup for
the pinion in the final drive case.

1. Put clean oil on the bearing cones on the pinion.
   Install pinion (5) in the final drive case. Put
   the bearing cup and retainer (7) in position, and
   install four 3/8"-16 NC bolts 1 1/2 in. long in
   the retainer to push the bearing cup far enough
   into the final drive case to install the correct
   bolts. Remove the 1 1/2in. long bolts, and
   install the correct bolts in the retainer.
   Tighten the bolts and be sure retainer (7) is
   tight against the final drive case.
2. Check pinion (5) for end play, and measure the
   torque needed to turn the pinion. If the end play
   is not more than 0.5 mm (.02 in.), and the torque
   is 1.1 Nm (10 lb.in.) or less, go to Step 8. If
   the end play is more than 0.5 mm (.02 in.), and
   retainer (7) is tight against the case, it will
   be necessary to install new parts. If the
   rotation torque is more than 1.1 Nm (10 lb.in.),
   install one 8G588 Shim under retainer (7), and
   check the torque again. Install only one shim at
   a time, and do not use more than three shims. If
   the torque is too high with three shims
   installed, and there is not foreign material
   under the cups, cones, or retainer, it will be
   necessary to install new parts.
3. Turn the final drive case over, and put it in
   position on tooling (A). Use four bolts and nuts
   to hold the final drive case in position on
   tooling (A). Weight is 943 - 72 kg (160 lb.),
   953 - 90 kg (200 lb.).

14
Earlier 943
Later 943 And 953 9. Heat the bearing (earlier
943) or bearing race (later 943 or 953) for gear
(8) to a maximum temperature of 120C (248F). Do
not heat the bearing longer than 8 hours. Install
the bearing (earlier 943) or bearing race (later
943 or 953) on gear (8). On an earlier 943, the
side of the bearing with the larger radius on the
inside diameter must be toward the shoulder on
the gear. After the bearing has become cool, use
a press to push the bearing tightly against its
seat. Put clean oil on the bearing.
Later 943 and 953 10. Install gear (8) in the
final drive case. On a later 943 or 953 final
drive, two 1/2"-13 NC forged eyebolts can be
installed in gear (8) to make the installation of
the gear easier.
15
Earlier 943
Later 943 And 953 11. Lower the temperature of
race (9) (earlier 943) or bearing (9) (later 943
or 953), and install the spindle. Be sure the
race or bearing is tight against its seat.
Install O-ring seal (10) on the spindle.
12. Install two 5/8"-11 NC guide bolts (12), at
least 6 in. long, in the final drive case. Fasten
tooling (D) and a hoist to spindle (11). Install
the spindle in its original position on the final
drive case. The spindle must be installed in the
same position on the case because there are holes
in the spindle that let oil move through the
final drive case. Weight of the spindle is 943 -
36 kg (80 lb.), 953 - 68 kg (150 lb.).
13. Put 9S3263 Thread Lock on the threads of bolt
(14), and install the bolt in the hole over the
pinion. The 9S3263 Thread Lock will prevent oil
leakage at bolt (14). Install the remainder of the
16
bolts that hold the spindle to the final drive
case, and tighten all the bolts to a torque of
270 25 Nm (200 18 lb.ft.). 14. Heat bearing
cone (13) to a maximum temperature of 120C
(248F). Do not heat the bearing longer than 8
hours. Install bearing cone (13) on the spindle.
After the bearing cone has become cool, push the
bearing cone tightly against its seat. Use a
thickness gauge or check for an air gap to be
sure the bearing is against its seat. Put clean
oil on the bearing cone.
15. Lower the temperature of bearing cups (15),
and install the bearing cups in the sprocket hub.
Use a thickness gauge to be sure the bearing cups
are against their seats.
16. Use tool (C) to install Duo-Cone seals (16)
in the sprocket hub and spindle. NOTE The rubber
seals and all surfaces that make contact with the
seals must be clean and dry. After installation
of the seals, put oil on the contact surfaces of
the metal seals.

1. Fasten tooling (D) and a hoist to the sprocket
   hub. Put the sprocket hub in position on the
   spindle. Weight is 943 - 84 kg (185 lb.), 953 -
   118 kg (260 lb.).
2. Install the outer bearing cone on the spindle,
   and put clean oil on the bearing cone.

17
19. Put hub (17) in position in ring gear (19) as
shown, and install ring (18) to hold the ring
gear and hub together.
20. Use two men to put ring gear (19) and the hub
in position on the spindle. Weight is 943 - 23
kg (50 lb.), 953 - 32 kg (70 lb.).
NOTE Use new bolts in retainer (20) any time the
final drive is disassembled.
18

• Put a preload on the sprocket hub bearings as
  follows
• Put retainer (20) in position on the spindle
  without shims, and install three old bolts at
  even intervals in the retainer.
• Turn the sprocket hub at 10 5 rpm during the
  adjustment procedure.
• Gradually tighten the three bolts in the retainer
  to a torque of 38 1 Nm (28 1 lb.ft.) to
  remove the end play in the bearings.
• Separately loosen and again tighten each bolt in
  the retainer until the bolt is against (seats)
  the retainer plate.
• 3. Tighten the three bolts to a torque of 943 -
  12 2 Nm (108 18 lb.in.), 953 - 22 5 Nm
  (193
• 45 lb.in.).
• Measure the shim gap at the three bolts as close
  to the bolts as possible. Remove the retainer.
• Install shims (21) with a total thickness the
  same as the average gap measured in Step F 0.00
  -
• 0.10 mm ( 0.000 - 0.004 in.). Put retainer (20)
  in position, and install new bolts to hold the
  retainer and shims in place.
• h. Turn the sprocket hub at 10 5 rpm while the
  bolts in the retainer are tightened. Tighten the
  bolts in a sequence around the retainer to 10 1
  Nm (7 1 lb.ft.), then to 50 5 Nm (37 4
• lb.ft.), then to 135 15 Nm (100 11 lb.ft.).

22. Install the bearings in planet gears (22).
Put all three planet gears (22) in position in
the planet carrier.
19
23. Fasten tooling (D) and a hoist to the planet
carrier. Put the planet carrier in position in a
press with supports (24) under the bosses for
planet shafts (23). Weight of the planet carrier
is 943 - 52 kg (115 lb.), 953 - 79 kg (175 lb.).
Start planet shaft (23) in the planet gear with
the groove in the shaft up as shown.
24. Use the press to push planet shaft (23)
through the planet gears until the grooves in the
top of the shafts are even with the planet
carrier as shown. Be sure to put a support under
the boss on the planet carrier while the planet
shaft is pushed through the planet gear.
25. Put plates (26) and locks (25) in position on
the planet carrier, and install the bolts that
hold them in place.
20

1. Install O-ring seal (28) on the sprocket hub.
2. Turn the planet carrier over, and install two
   3/8"-16 NC forged eyebolts (27). Fasten a hoist
   to the planet carrier, and put the planet carrier
   in position on the sprocket hub. Weight is 943 -
   52 kg (115 lb.), 953 - 79 kg (175 lb.). Install
   the bolts that hold the planet carrier to the
   sprocket hub, and tighten to a torque of 200 25
   Nm (150 20 lb.ft.).

28. Install a 3/8"-16 NC forged eyebolt in shaft
(sun gear) (29), and install the shaft (sun gear)
in the planet.
29. Use tooling (B) to install button (30) in
cover (31).
30. Use 7M7260 Liquid Gasket Material as a seal
for cover (31) and the planet carrier. Put
cover (31) in position on the planet carrier, and
install the bolts that hold it in place. Put
9S3263 Thread Lock on the threads of the bolts
that hold the cover in place.
21

• Fasten a hoist, and remove the final drive from
  tooling (A). Weight is 943 - 359 kg (785 lb.),
  953 - 495 kg (1100 lb.).
• END BY
• install track brakes
• install final drives and sprocket assemblies

Copyright 1993 - 2022 Caterpillar Inc. All Rights
Reserved. Private Network For SIS Licensees.
Thu Jan 6 011317 UTC0800 2022
22
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Product TRACK LOADER Model 953 TRACK LOADER
20Z Configuration 953 LGP TRACK LOADER
20Z00267-UP (MACHINE) POWERED BY 3204 ENGINE
Disassembly and Assembly 943 953 TRACK-TYPE
LOADER POWER TRAIN Media Number
-SENR4215-00 Publication Date -01/03/1985
Date Updated -11/10/2001
Pump (Track Brake Release) SMCS - 4050-011
4050-012 4050-015 4050-016 Remove Pump (Track
Brake Release) START BY a. lift cab (24
position) NOTE Earlier model loaders used a hand
pump mounted in the cab to release the parking
brake pressure. The later model loaders have
eliminated the cab mounted hand pump as well as
the bleed tubes and U-tubes which were located in
the engine compartment. FT1845 Brake Release
Group is available as a replacement for the
earlier used hand pump. See Service Magazine,
April 16, 1984, for instructions on construction
and usage of the FT1845 Brake Release Group.
1. Disconnect oil lines (1) from pump (2) for
track brake release.
2. Loosen the setscrews in knobs (3). Hold the
pump and valve stems, and loosen knobs (3) and
remove.
23
3. Remove nuts (4) and pump (2) for track brake
release.
Install Pump (Track Brake Release)

1. Put the pump for track brake release in position
   on the cab, and install nuts (2) that hold it in
   place.
2. Hold the pump and valve stems, and install knobs
   (1). Tighten the setscrews in the knobs that hold
   them in place.

• Connect oil supply line (3) from the oil pan on
  the hydrostatic power control unit to the pump.
• Connect oil pressure line (4) from the bracket on
  the left side of the frame to the pump. END BY
• lower cab (24 position)
• remove air from track brakes
• For the procedure to remove air from the track
  brakes, see Testing And Adjusting.

Disassemble Pump (Track Brake Release)
START BY a. remove pump (track brake release)
24

1. Loosen collar (1), and remove the pump stem
   assembly.
2. Loosen collar (2), and remove the brake engage
   stem.
3. Remove fittings (3) from the block.

1. Use tool (A) to remove snap ring (4) from the
   block. Remove plug (5), spring, stem, washers and
   ball for the pump relief valve from the block.
2. Put identification on the block as to the
   location of the components.

6. Use tool (A) to remove snap rings (6) from the
block. Remove plug (7), spring and valve from
block. Remove plug (8), spring and valve from
block. Remove the plug, spring and valve from
port (9) after plug (8), spring and valve are
removed.
Assemble Pump (Track Brake Release)
1. Be sure all passages in the block are clear.
Put clean oil on all parts before assembly.
25

1. Install check valve (1), spring (3) and plug (5)
   in the block. Plug (5) must be pushed past the
   opening for plug (6) so plug (6) can hold plug
   (5) in place.
2. Install brake engage valve (2), spring (4) and
   plug (6) in the block as shown. Use tool (A) to
   install snap ring (7) in the block.

4. Install check valve (8), spring (9) and plug
(10) in the block. Use tool (A) to install snap
ring (11) in the block.
5. Install ball (12), stem and washers (13),
spring (14) and plug (15) for the pump relief
valve in the block. Use tool (A) to install snap
ring (16) in the block.
6. Install pump stem and collar (17) in the block
as shown.
26
7. Be sure O-ring seal (19) is in position on the
brake engage stem. Install brake engage stem and
collar (18) in the block as shown.
8. Install fittings (20) and (21) in the block as
shown. END BY a. install pump (track brake
release)
Copyright 1993 - 2022 Caterpillar Inc. All Rights
Reserved. Private Network For SIS Licensees.
Thu Jan 6 011412 UTC0800 2022
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Product TRACK LOADER Model 953 TRACK LOADER
20Z Configuration 953 LGP TRACK LOADER
20Z00267-UP (MACHINE) POWERED BY 3204 ENGINE
Disassembly and Assembly 943 953 TRACK-TYPE
LOADER POWER TRAIN Media Number
-SENR4215-00 Publication Date -01/03/1985 Track
Brakes SMCS - 4050-011 4050-012 4050-015
4050-016
Date Updated -11/10/2001
Remove Track Brakes START BY a. remove final
drives
28

1. Disconnect oil lines (3) from housing (5).
2. Remove bolts (1) and oil manifold (2).
3. Loosen bolts (4) evenly to release the tension in
   the springs in housing (5) for the track brake.
   Remove bolts (4) and housing (5).

1. Bend the ends of two short pieces of wire. Use
   the wires to remove discs (6) and plates (7) from
   ring (8).
2. Remove ring (8) from the final drive case only if
   a replacement is necessary.

Install Track Brakes

• Put 6V6640 Gasket Maker on the outside diameter
  of ring (2). Install ring (2) on the final drive
  case with the holes in the ring in alignment with
  the bolt holes in the case.
• Put clean SAE 30 oil on each brake disc (3) and
  brake plate (1) before assembly.
• NOTE A brake disc is made of friction material,
  and there are five discs for each track brake. A
  brake plate is made of steel, and there are four
  plates for each track brake.
• Install brake discs (3) and brake plates (1) in
  ring (2). Start and stop with a brake disc.

29
4. Put brake housing (4) in position on the ring
with the holes in the brake housing in alignment
with the holes in the ring, and install the bolts
that hold it in place.

• Put oil manifold (5) in position on the final
  drive case, and install the bolts that hold it in
  place.
• Connect oil lines (6) and (7) to the brake
  housing. END BY
• a. install final drives

Disassemble Track Brakes
START BY a. remove track brakes
1. Put two bars (1) across the plate as shown.
Bars (1) are flat pieces of steel approximately
16.5 cm x 31.8 mm x 6.4 mm (6 1/2 in. x 1 1/4 in.
x 1/4 in.). Put ring (2) over the bars as shown,
and install two bolts (3) through ring (2) and
the housing, and install washers and nuts on the
bolts. Bolts (3)
30
are 3/8"-16 NC bolts, 5 in. long. Tighten bolts
(3) evenly to put the springs in the track brake
in compression. Use a soft hammer to push piston
(4) through the plate so ring (5) can be removed.
Use tool (A) to remove ring (5) from the piston.
Bolts (3) are used to hold the springs in the
track brake in compression so ring (5) can be
removed. Ring (2), bars (1) and plate (6) can be
released rapidly and cause injury if the tension
in the springs is not released before bolts (3)
are completely removed. Be sure all the tension
in the springs is released before bolts (3) are
removed.

1. Loosen bolts (3) evenly to release the tension in
   the springs in the track brake.
2. Remove bolts (3), ring (2), bars (1) and plate
   (6) from the track brake housing.

4. Remove two springs (7) from the track brake
housing.

1. Use a soft hammer to push piston (4) out of the
   track brake housing.
2. Remove O-ring seal (8) from the parking brake
   housing.

31
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32
7. Remove seal assemblies (9) and (10) from the
piston.
Assemble Track Brakes
NOTE Put clean oil on all parts before assembly.
1. Install seals (1) and (2) on the piston as
shown.

1. Install piston (3) in the track brake housing as
   shown.
2. Install O-ring seal (4) on the track brake
   housing.

4. Install springs (5) in the track brake housing
as shown with the inside diameters of the springs
together and the outside diameters apart.
33

• Install plate (10) with the counterbore for the
  ring up.
• Put two bars (6) across plate (10) as shown. Bars
  (6) are flat pieces of steel approximately 16.5
  cm x 31.8 mm x 6.4 mm (6 1/2 in. x 1 1/4 in. x
  1/4 in.) Put ring (7) over the bars as shown, and
  install two bolts (8) through ring (7) and the
  housing, and install washers and nuts on the
  bolts. Bolts
• (8) are 3/8"-16 NC bolts, 5 in. long. Tighten
  bolts (8) evenly to put the springs in the track
  brake in compression. Use a soft hammer to push
  the piston through the plate so ring (9) can be
  installed. Use tool (A) to install ring (9) in
  the groove in the piston.
• Loosen bolts (8) evenly and let the springs in
  the parking brake push plate (10) over ring (9).

Ring (9) holds plate (10) in place. Plate (10)
holds the springs in compression. Ring (9) and
plate (10) can be released rapidly and cause
injury if ring (9) is not completely engaged in
the groove in the piston and counterbore in plate
(10) before bolts (8) are removed. Do not remove
bolts (8) until ring (9) is completely in the
counterbore in plate (10) and engaged the groove
in the piston.
8. Remove bolts (8), ring (7) and bars (6) from
the track brake housing. END BY a. install track
brakes
Copyright 1993 - 2022 Caterpillar Inc. All Rights
Reserved. Private Network For SIS Licensees.
Thu Jan 6 011508 UTC0800 2022
34
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Previous Screen
Product TRACK LOADER Model 953 TRACK LOADER
20Z Configuration 953 LGP TRACK LOADER
20Z00267-UP (MACHINE) POWERED BY 3204 ENGINE
Disassembly and Assembly 943 953 TRACK-TYPE
LOADER POWER TRAIN Media Number
-SENR4215-00 Publication Date -01/03/1985
Date Updated -11/10/2001
Track Motors SMCS - 4351-015 4351-011 4351-012
35
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